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#sedimentology

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Or M. Bialik

Some non #MinCup24 related mineralogy.
The discussions around calcite made me think of the database of grains in sediment from my 2023 paper (nature.com/articles/s41598-023).
There is this thing we tell: aragonite is more common in the #ocean in low latitudes than in high latitudes. But I can show that with my #research !
I reprocessed the data for the shelves to show how carbonate grain mineralogy changes with latitude - for the #sedimentology classroom.

Continued thread
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John Faithfull🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡 ✊🏼✊🏿

These mini-source-to-sinks are quite common - here are some beauties from a different beach, on the north coast of the Ross of Mull. I think they may be associated with almost invisible large, low-angle ripples on the sand surface, with the branched erosive head on the steep down-beach face of one ripple, and the lobed termination at the trough, or base of the upslope, of the next ripple down the beach. #Sand #Geology #Sedimentology #Beaches

Wet, quartz beach sand with parallel bands of thin surface accumulations of whiter shell debris. Little linear tree-like structures extend from each of the upper pale shell-rich bands, to the start of the next pale band. Each of these is eroding sand from the upper end, and transporting it down to the bulbous, lobed lower end.
Wet, quartz beach sand with parallel bands of thin surface accumulations of whiter shell debris. Little linear tree-like structures extend from each of the upper pale shell-rich bands, to the start of the next pale band. Each of these is eroding sand from the upper end, and transporting it down to the bulbous, lobed lower end.
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John Faithfull🌍🇪🇺🏴󠁧󠁢󠁳󠁣󠁴󠁿🧡 ✊🏼✊🏿

The endless wonders of #Sand 🤓 🥰 . After the last few days dogwalking on Ross of Mull beaches, I'm a bit obsessed by these mini examples (typically 15-30 cm long) of "source to sink" erosion, transport, and sedimentation. Each of these little systems has branched headwall erosion at the upslope end, a narrow, straight transport channel, and a lobed fan of deposition at the bottom end. For more on "source to sink" see e.g. usgs.gov/media/images/sediment #Geology #Sedimentology #Beaches

Damp, clean pale greyish quartz sand, with a thin faint whiter surface layer of shell debris fills the field of view. A green wellington boot toe can be seen at the bottom centre of the image. Across the central part of the image a series of roughtly parallel linear structures can be seen in the sand. Each has a branched "tree-like" top where sand is being eroded, a straight middle where sand is being transported, and a broad, lobed bottom, where sand is being deposited.
Damp, clean pale greyish quartz sand, with a thin faint whiter surface layer of shell debris fills the field of view. A green wellington boot toe can be seen at the bottom right of the image. FRom upper right to bottom left of the image a series of roughly parallel linear structures can be seen in the sand. Each has a branched "tree-like" top where sand is being eroded, a straight middle where sand is being transported, and a broad, lobed bottom, where sand is being deposited.
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Tim Demko

Hi all! I’ve just moved from another instance, so apologize for the repetition. I’m a geologist, currently working in public service (views here are my own!), supporting exploration for critical minerals and the energy transition.

My research interests are in the sedimentology, process stratigraphy, and ichnology of deep water, fluvial, and marginal marine deposits.

#geology#geoscience#EarthScience
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